“Tonight New York City experienced a very serious incident,” de Blasio said in a press conference. “Whatever the cause, whatever the intention here, New Yorkers will not be intimidated. We are not going to let anyone change who we are or how we go about our lives.”

Stars quickly took to Twitter both to let fans know they were safe and to extend their condolences to those hurt in the blast.

Jersey Shore alum Nicole “Snooki” Polizzi also tweeted, noting that there was another explosion in her home state on the same day.

“Explosion on the jersey shore & the city today…this ones close to home.Praying for the injured & the world. Hugging my babies extra tight,” she wrote. The explosion in Seaside Park did not result in any injuries and has not been linked to the New York City incident.

Explosions on the jersey shore & the city today...this ones close to home.Praying for the injured & the world.Hugging my babies extra tight!